# Chi square Test of Independence

2. A state collects data on whether cell phone use while driving contributes to accidents. The 2 x 2 contingency table below is filled in. Complete the Chi Square test of independence by calculating the Chi Square test statistic.

Accident Last Year No Accident Last Year Total

Cell Phone in Use 30 (38.43) 350 (341.57) 380

Cell Phone not in Use 60 (51.57) 450 (458.43) 510

Total 90 800 890

Numbers in parentheses are the expected frequencies. Numbers not in parentheses are the observed frequencies.

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#### Solution Preview

Please refer attached solution for complete details. Work done with the help of equation writer may not print here.

Solution :

Let Pc represent the fraction of accidents while using cell phones

Pn represent the fraction of accidents while not using cell phones

Ho: Pc=Pn ...

#### Solution Summary

Solution expains the steps to determine whether accidents are related to use of cell phone while driving.